HTC's confirmed to Engadget that the "cupcake" OS Update will should be available to …
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According to the rep, the update (dubbed RC31) is, in fact, coming to the T-Mobile G1 with an end of January target for release. Furthermore, the update "will be done in stages “Over The Air” but it will be by region, not when you purchased the G1."

There is a lot riding on the shoulders of T-Mobile's G1 Android phone. In some ways, it…
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Interestingly, the rep also noted that T-Mobile has a battery improvement program for the G1 in the works, which should come as a relief to the throngs of customers who have been disgusted and appalled at the now infamous lack of battery life. [Google and BlogThanks Luis!]